Band-saw mill



.(No Model.) 2 Sheets-Sheet 1. H. R. BARNHURST.

BAND SAW MILL.

No. 338,017. Patented Mar. 16, 1886.

Inventor Per. il K 7 Ad /S PETERS. Pholc-Lllhugnphcr. wm'in mn'. n. c.

2 SheetsSheet 2. H. R. BARNHURST.

(No Model.)

BAND SAW MILL.

No. 338,017. Patented Mar. 16, 1886.

HENRY B. BARNHURST, OF ERIE, PENNSYLVANIA.

BAND-SAW MILL.

$PECIPICATION forming part of Letters Patent No. 338,017, dated March 16, 1886.

Application filed November 23, 1885. Serial No. 183,751. Xo model.)

To all whom it may concern.-

Be it known that I, HENRY R. BARNHURST, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented certain new and useful In1- provements in Band-Saw Saw-Mills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to that type of sawmills in which a band-saw is used; and it consists in certain improvements in the construction thereof, as will be hereinafter fully set forth, and pointed out in the claims.

In saw-mills of the type above named the band-sa'v runs on two large band-wheels, one of which, the lower, usually, is on the driving-shaft of the mechanism, and the other is driven by the band-saw acting as a belt. I will hereinafter refer to these wheels as the driving-wheel and the driven wheel, respectively. WVhenever the saw commences to act upon a log, or when it encounters a hard knot in the log, the load upon the driving mechanism is increased and there will be an instantaneous slacking up of the speed of the driving-wheel. Other extra loadsthrown upon the motor by other machinery in the mill will also produce a like checking up of the drivingwheel. The driven wheel receiving all its drivingpower through the band-saw acting as a belt, one side of said beltthe downward moving sidewill of course be strained taut, while the other side will be as slack as the length of the saw will permit. In lar e saw-mills, used for sawing logs, these wheels are very large, and though made as light as possible they have considerable weight, and consequently the inertia of the driven wheel is considerable, and when a checking of the speed of the driving-wheel occurs the driven wheel will not respond at once to the change, but will by its momentum continue to move at the same speed it was moving. This action will momentarily change the driven wheel into a driving-wheel, so far as the saw is concerned, and the slack side of the saw will he suddenly drawn taut and the taut side be slackcned. The effect of this action is often abreakage of the saw, and always an uneven saw-kerf in the log or cant.

To obviate the above difficulty, builders of this type of mill have provided various devices-such, for example, as wings or fans on the spokes of the driven wheel, or driving other machinery in the mill from a pulley on the shaft of the driven wheel. Such devices are intended to afford sufficient resistance to the rotation of the driven wheel to prevent it moving by its momentum when the speed of the driving-wheel is slackened'.

My invention relates particularly to the means for thus loading the driven wheel; and it consists ofa pa ddle-wheel keyed to the shaft of that wheel, a box surrounding said paddlewheel and journaled on the same shaft therewith, which'box is supplied with oil, water, or other fluid to be agitated by said paddlewheel.

The use of fans on the spokes of the driven wheel is objectionable, because the fans to effect the desired result must be so large as to create so strong a current of air as to interfere with the attendants.

My device is very simple and compact, and it in no way interferes with the attendants or the operation of the mill. It is illustrated in the accompanying drawings as follows:

Figure 1 is a front elevation view, showing the upper or driven band-wheel, the framework in which it is hung, the column in which the framework is adjusted, and my device in place on the band-wheel shaft. Fig. 2 is a side elevation of the same parts. Fig. 8 shows the shaft of the band-wheel and the paddlewheel in elevation and the surrounding box in vertical section on the line of the shaft. Fig. 4 shows half of the box in vertical section on a line transverse the shaft and the pad J dle-wheel in elevation. Fig. 5 is a view of the pipe D, seen in Figs. 1 and 2.

The construction and parts shown are as follows: A is the supportingcolumn.

A is the frame-work in which the upper band-wheel is journaled, and it is mounted to slide vertically on the column A.

B is the upper or driven band-wheel, and B is its shaft, which is journaled in the boxes a a on the frame-work A.

IOC

E is the paddle-wheel.

O is the surrounding box.

D is a pipe leading from the box, and D is a nipple for a pipe leading into the box.

In this type of mill the driven band-wheel must be made adjustable vertically, so as to properly strain the saw, and so that saws of different lengths may be mounted, and whatever mechanism is applied to the shaft of this bandwheel, for the purposes above stated, must be free to move vertically with the shaft. It will be seen that my device is wholly mounted on the shaft; but the box 0 must be held so that it will not rotate. This -I do by making the pipe D a lever, which I attach to some fixed point,'preferably by a flexible connectionsuch as the spring F.

The box 0 is provided on its inside with ribs 0 c, &c., to prevent the fluid moving freely with the paddles.

It is necessary that the fluid be continuously supplied to the box and allowed to flow from it, or else it would become heated by the in tense mechanical action it receives. To effect this a pipe will connect a reservoir (say a barrel sitting on the frame-worlgof the mill above the parts shown) with the nipple D, and a hose or other pipe will connect the pipe D with the same reservoir. Then as the paddle-wheel is operated it will force the fluid from the box through the pipe D into the reservoir, from which it will run into the box again through the pipe connected at D.

The degree of resistance may be varied by varying the width or length of the paddles or by changing the fluid used, the more viscid the fluid the greater the resistance, of course.

Of course it will be understood that the pipe D need not be the lever by which the box is fluid need not be used over and over, but the induct-pipe may connect with a supply and the educt run to a wasteway.

It is not essential that the resisting device be mounted on the shaft of the driven wheel, for it may be mounted at a distance from it and operated by any desirable gearing from the said shaft.

While it has been practiced to drive a common air-blower from this shaft for the purpose of loading the driven band-wheel, the substitution of my resisting device for the air-blower will be an improvement, for my device, having all the resisting force desired, can be made at much less expense than an air-blower of sufli cient resistance.

\Vhat I claim as new is 1. In a band-saw saw-mill,.the combination with the shaft of the driven band-wheel, of a paddle-wheel fixed on said shaft, afluid-holding box surrounding said paddle-wheel and journaled concentrically therewith on said shaft, a fastening for preventing said box fro'm rotating with the shaft, and conduits for conveying fluid to and away from said box, substantially as and for the purposes set forth.

2. In a band-saw saw-mill, the combination, with the shaft of the driven band-wheel, of a resisting device consisting of a box or case, 0,

having internal ribs, 0, and an induct and educt for the admission and discharge of fluid 

